Modbus Relay Output Module
DAT3138
The DAT3138 Modbus Relay Output Module provides 8 independent relay outputs, controlled via Modbus RTU over RS-485. It is designed for industrial automation applications requiring reliable relay switching directly from a Modbus network.
Each output is a Single Pole Double Throw (SPDT) relay, isolated from each other, the power supply, and the Modbus line. The relays are rated for 2 A at 250 VAC or 30 VDC, with 1000 Vac isolation between contacts and 4000 Vac isolation between contact and coil.
Front panel LEDs provide clear indication of power, transmit/receive communication, and the status of each relay output. Configuration of the DAT3138 is performed using the free DAT3000–DAT10000 software, available from the Datexel download page.
| INPUT | OUTPUT | POWER SUPPLY |
|---|---|---|
| Modbus RS485 | 8 Relays SPDT | Power Supply Voltage 18-30Vdc |
| Reverse polarity protection 60Vdc | ||
| CURRENT CONSUMPTION | CONFIGURATION | ISOLATION |
| 100 mA Max. | PC Programmable | Between Input/Comms/Power Supply 1500Vac. |
| EMC | HOUSING | TEMPERATURE |
| For Industrial environments | Material self-extinguishing | Operating Temperature 14°F +140°F -10°C +60°C |
| Immunity EN 61000-6-2 | Dimensions W x H x T 4" x 4 3/4" x 3/4 " | Storage Temperature -40°F +185°F-40°C +85°C |
| Emission EN 6100-6-4 | 100 x 120x x 22.5 mm | Humidity (non condensing) 0-90% |
| Weight 3 oz 90g |
| Output: | |
| 8 SPDT Relays | 2 Amp 250 VAC, 2 Amp 30Vdc. |
| Communication: | RS485 Modbus RTU ASCII. |
| Power Supply: | 18 - 30 Vdc. Reverse polarity protection 60 Vdc. |
| Current Consumption: | 20 to 100 mA. |
| Temperature rating: | Operative Temperature -14°F +140°F -10°C +60°C Storage Temperature -40°F +185°F -40°C +85°C. |
| Humidity: | (not condensing) 0-90%. |
| Housing: | Material self-extinguishing. |
| Dimensions: | W x L x H 3 3/4X 3 1/2 X 1 7/8 inch, 90 x 74 x 48mm. |
| Weight: | 7 1/2" 200 g. |
| EMC. | For industrial environments. |
| Immunity: | EN 61000-6-2. |
| Emission: | EN 61000-6-4. |
| Isolation: | Between Modbus Master, Slave/Power supply 1500Vac, 50Hz, 1 Minute. |
| Configuration: | PC Configurable. |
| Default Comms Settings | |
| Address | 1 |
| Baud-rate | 38400 bps |
| Protocol | RTU |
| Output | |
| Relay Output 0 | Common 1 Normally open 2 Normally closed 3 |
| Relay Output 1 | Common 4 Normally open 5 Normally closed 6 |
| Relay Output 2 | Common 7 Normally open 8 Normally closed 9 |
| Relay Output 3 | Common 10 Normally open 11 Normally closed 12 |
| Relay Output 4 | Common 13 Normally open 14 Normally closed 15 |
| Relay Output 5 | Common 16 Normally open 17 Normally closed 18 |
| Relay Output 6 | Common 19 Normally open 20 Normally closed 21 |
| Relay Output 7 | Common 22 Normally open 23 Normally closed 24 |
| Positive | +V | Terminal G |
| Negative | -V | Terminal F |
| Positive | D+ | Terminal B |
| Negative | D- | Terminal A |
| Ground | GND | Terminal C |
| INIT | Terminal G |
| Ground | Terminal F |